# Objective
Fixes  #13230

## Solution
Uses solution described in  #13230
They mention a worry about adding a branch, but I'm not sure there is
one.

This code
```Rust
#[no_mangle]
pub fn next_if_some(num: i32, b: Option<bool>) -> i32 {
    num + b.is_some() as i32
}
```
produces this assembly with opt-level 3
```asm
next_if_some:
        xor     eax, eax
        cmp     sil, 2
        setne   al
        add     eax, edi
        ret
```

## Testing
Added test from #13230, tagged it as ignore as it is only useful in
release mode and very slow if you accidentally invoke it in debug mode.

---

## Changelog
Iterationg of ListIter will no longer overflow and wrap around

## Migration Guide